Breech packing for firearms



Oct. 25, 1938. J. HASEK BREECH PACKING FOR FIREARMS Filed March 6, 1936 Patented Oct. 25, 1938 BREECH PACKING FOR FIREARMS Jaroslav Hasek, Prague, Czechoslovakia Application March 6, 1936, 'Serial In Czechoslovakia March 8,1935

3 Claims.

This invention relates to breech packings for fire-arms, and constitutes a further development of and improvement on the breech packing forming the subject matter of Patent No. 2,117,885 (co-pending application Serial No. 52,819). In the said prior patent the packing is in the form of a disc of deformable material which is mounted on the breech block and so shaped that the pressure of the gases generated on the firing of the charge brings about an enlargement of the diameter of this disc which is thereby caused to bear with its periphery against the wall of the barrel. At the same time this packing disc is suitably associated with the explosive charge and is placed simultaneously with the latter in the position for firing.

With the improvement according to the present invention the packing element, which is in the form of a disc made from deformable mtaerial, is provided with means which are so designed and arranged that the operations in loading and in extracting the case after firing do not differ in any respect from those required when using standard ammunition with normal cartridgecases. The construction according to the invention is such that no alterations or adaptations need be eifected to the fire-arm itself, so that it is perfectly possible in one and the same fire-arm to use both the old and the new type of ammunition.

In accordance with the invention this result is achieved by providing beneath the packing disc proper a rigid and non-deformable disc (preferably of iron). Consequently the barrel of the fire-arm can be left unaltered in the immediate vicinity of the breech, and the means for extracting the empty cartridge-case acts in precisely the same manner with this new ammunition as with ordinary ammunition, while at the same time any desired type of breech mechanism can be employed which is designed for use with normal cartridge-cases.

Since the packing disc is corrugated or cambered and only becomes effective as a packing means after it has become deformed to a certain extent, the connection of this disc with the non-deformable backing disc must be such that the deformation of the former is not impeded on the firing of the charge.

Further details and features of the improved breech packing according to the present invention will become apparent in the course of the ensuing description taken in conjunction with the accompanying drawing in which a form of construction embodying the invention is shown, by way of example, in Figs. 1 to 3.

In the drawing:

Fig. 1 is a fragmentary longitudinal crosssection through a breech packing constructed in accordance with the invention, showing a special configuration of the packing seating surface onthe barrel of the fire-arm.

Fig. 2 is a similar view, showing a modified form of the packing adapted for use in conjunction with any fire-arm in which ordinary cartridges maybe used; and

Fig. 3 is a similar view showing a further modified form of the packing disc.

In the form shown in Fig. 1 the barrel of the fire-arm is provided with a flared packing seating surface which differs from that required when ordinary cartridge-cases areused. In this figure 2 denotes the deformable packing disc, while 9 denotes the rigid-non-deformable backing disc which is connected to the former by means of the screw joint IEI. In the screwthreaded boss there can be provided the detonating cap 3, and the entire assembly is mounted in the end of the barrel l of the fire-arm. l I denotes the means for extracting the empty case after firing.

In the form of construction shown in Fig. 2 it is necessary to strengthen the portion of the rigid disc 9 extending into the bore of the barrel I so that the deformable packing disc 2 bears at a point which is not weakened by the extracting means II.

In the form of construction shown in Fig. 3 the packing disc 2 is arched or cambered in a manner different from that adopted in the previous examples, and constitutes a continuous spherical arch. As means of connection between this packing disc 2 and the non-deformable disc 9 these is again employed screw threading I! on the inner periphery of the fixed portion of the packing disc so that the threaded joint does not impede the required deformation of the packing disc on the spreading of this latter. In order to ensure that the packing disc becomes extracted simultaneously with the rigid disc 9 the deformation of the packing disc is caused to bring about interlocking engagement between the two discs, for instance as shown at l3 in Fig. 3. The backing disc can also be provided with an aperture I6 for engagement by a boss IS on the spreading disc, in which the detonating cap or igniting charge finds accommodation.

I claim:

2. A breech packing for fire-arms, comprising a packing disc composed of non-resilient deformable material, said disc being forwardly arched and having a rearwardly extending interiorly threaded flange, a rigid non-deformable backing behind said disc and provided with a threaded portion engaging said flange threads, and norminimum mally disengaged interlocking elements on said disc and backing, said elements being adapted to engage with each other when the deformable disc straightens out upon firing, one of said interlocking elements being an outwardly projecting rim on said flange.

3. A breech packing for fire-arms, comprising a packing disc composed of non-resilient deformable material, said disc being forwardly arched.

and having a rearwardly extending interiorly threaded flange, a rigid non-deformable backing behind said disc and provided with a threaded portion engaging said flange threads, said backing having a medial aperture and said disc having a boss rearwardly extending into said aperture, said boss being adapted to accommodate at least a detonating cap.

JAROSLAV HAsEK. 

